21415315024 has 20 divisors (see below), whose sum is σ = 41688824800. Its totient is φ = 10656908640.

The previous prime is 21415315001. The next prime is 21415315027. The reversal of 21415315024 is 42051351412.

It is a junction number, because it is equal to n+sod(n) for n = 21415314983 and 21415315001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21415315027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3168324 + ... + 3175075.

It is an arithmetic number, because the mean of its divisors is an integer number (2084441240).

Almost surely, 2^21415315024 is an apocalyptic number.

It is an amenable number.

21415315024 is a deficient number, since it is larger than the sum of its proper divisors (20273509776).

21415315024 is a wasteful number, since it uses less digits than its factorization.

21415315024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6343618 (or 6343612 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

Adding to 21415315024 its reverse (42051351412), we get a palindrome (63466666436).

The spelling of 21415315024 in words is "twenty-one billion, four hundred fifteen million, three hundred fifteen thousand, twenty-four".